Mine post or jack



Dec. 20, 1927. v 1,653,126

. F. H. *SCHWERI'N MINE POST 0R JACK Filed July so. 1925 3 Shees-Sheet 1 INVENTOR BY E ATTORNEY ,7

Dec. 20, 1927.

F. H. SCHWERIN MINE POST 0R JACK Filed July 50, 1925 3 $heets-$heet 2 y INVENTOR A TTOR/VEY Dec.20, 1927. I 1,653,126

F. H. SCHWERIN Filed July 50, 1923 5 Sheets-Sheet 3 Patented Dec. 20, 1927.

UNITED STATES 1,653,126 PATENT OFFICE.

FRANK H. SCHWERIN, OF WEST VIEW, PENNSYLVANIA, ASSIGNOR TO THE DUFF MANUFACTURING COMPANY, OF PITTSBURGH,- PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

' MINE rosr on JACK.

Application filed July 30, 1923. Serial No. 654,581.

cut, the support being advanced as the cut is advanced, and being removed in the rear so as to allow the roof to cave in.

An embodiment of the invention is a mechanical, hinged post, having ball-jointed plates at its upper and lower ends and means, of supporting nature, for readily extending and contracting the distance between such ends and exerting pressure, and means for tripping and withdrawing the post, so that it can be used-repeatedly.

The invention comprises important features of novelty in respect to the means for locking and for tripping, or breaking,-the knuckle-jointed sections adapted for mineposts or for other devices of the jacking or bracing class. 1

In the accompanying drawings illustrating the invention: V

Fig. 1 is a side elevation of the post in erect position, a. portion of awall being shown broken away and in section;

Fig. 2 is an elevation similar to Fig. 1, but showing the post in the act of being tripped, an intermediate portion of the tripping arm being broken out because of lack' of space;

Fig. 3 is a rear elevation on a larger scale,

most of the upper section being broken away;

Fig. 4 is a sectional elevation of the upper part of the upper post section, its cap plate being omitted;

Fig. 5 is a cross-section on the line 5-5 of Fig. 4;.

Fig. 6 is a vertical section on a still larger scale through the knuckle and lock, showing the parts in the vertical, locked position;

and r Fig. 7 is a view like Fig. 6, showing the unlocked and tripping condition.

The post comprises a lower, shorter section 1, and an upper, longer section 2, the bodies of the sections being advantageously formed of tubes 3 and 4.-

Pinned in. the proximate ends of these tubes are blocks 5, 6 forming a'knuckle or hinge joint adapted to fold in one direction. The upper block 5 is shown-provided with a hinged member and 'the lower block with a pair or hinge members 8, the hinge members being pierced for the passage of a substantially central hinge pin 9. Abutment of the surfaces 10, 11. of the blocks at one side of the hinge axis aidin sustaining the load and prevent buckling toward the opposite side while permitting buckling toward that side.

-A block 12 pinned into the lower end of the tube 3 carries a ball 13 which'coa'cts with a socket in a foot plate 14.

In the upper part of the tube 4 there is 7 telescoped a longitudinal screw 15, having a ball 16 at its upper end, which carries a socketed cap plate 17. The screw and cap plateflare movable up and down by a nut 18, which is retained in a swiveled manner on the upper end of the tube 4, by set-screws 19 entering a circumferential groove 20. Tangential sockets 21 on the nut provide for the reception of a lever bar.

The hinge member 7 is formed at the side 30 of the hinge axis toward which the 0st will buckle with an extension 22 containing an arcuate locking notch 23, and corresponding lateral extensions 24. 'on the hinge members 8 are perforated to receive the. cylindrical journal portions of a locking pin'25, the

central portion of which is positioned to fit the notch 23 when the two sections of the post arein alinement, thereby preventing the knuckle from flexing. The central portion of the locking pin is mutilated," however, by'being-slabbed off at one side, as shown at 26, so that when the pin .is turned to a certain position the locking portions are free, as seen in Figs. 2 and 7 so that the post i can be collapsed.-

A pendent arm 27 is pinned to the pin 25 and normally hangs down alongside the. lower post section. In this position of the arm the connected locking pin is in such a position that the knuckle can not be broken (see Fig. 6) and the weight ofthe arm and thefact that it must be swung outward and upward a considerable distance before the knuckle will, unlock render accidental unlocking unlikely. 1 I

In order to insure absolute security, however, a secondary latch or catch is provided for the arm itself. In the illustrated construction a piece 28 is hung on a pivot pin 29 in the bifurcated lower end of the arm, and this piece is made with a catch hook 30, which projects toward the lower post section, the shoulder of the hook being at the top. This catch element enters a recess 31 in the wall of the tube 3, its hook shoulder catching behind the wall at'the upper edge of the opening, in which position it is retained by gravity owing to the center of mass of the piece 28 being properly disposed for this purpose. The nose 32 of the hook is beveled so that it will automatically. enter the open ing and catch when the arm is allowed to swing down to its normal position.

An eye 33 or equivalent form is'provided upon the piece 28, for engagement by a suitable hook-handle or grapple. In this way the piece 28 can be conveniently swung on the arm 2-7 until the catch 30 is disengaged, and the arm then swung upward to the position where it will unlock the knuckle lock, after which an outward pull upon the arm will collapse the prop, and it can be drawn away in safety.

When the post is reset in a new position, it is elongated or contracted as may be required by the screw and nut, and when in position is set by the same means into full bearing between the floor and roof. WVhen the sections are in alinement they will become locked upon permitting the arm 27 to swing downward. The self-adjusting ball and socket connections between the remote ends of the sections and the cap and foot plates are important in both the setting and the collapsing operations. In Fig. 2 it will be seen that when the post is tripped the two plates do not partake of the angular movement of their sections 1 and 2, so that the post can not bind.

While the preferred embodiment of the invention has been described in detail, I wish it to be understood that there may be various changes in form and proportions and in respect to substitutions and omissions. While the invention finds its special value as a mine post, other shoring and bracing purposes are not necessarily excluded.

What I claim as new is:

l. A mine post comprising two abutting sections connected by a knuckle, one of said sections comprising telescopic parts extensible and contractible and including jack screw and nut-and operating means for ex erting the endwise pressure against the mine floor and roof when, the post is in place, two plates ball-jointed to the remote ends of the sections, and a lock for the knuckle, release of which permits the post to be tripped and bodily withdrawn from position.

2. In a device of the class described having two sections, a knuckle connecting the proxi mate ends of the sections, one part of the knuckle having a lock notch, and a turnable lock pin in the other part.

3. In a device of the class described having two sections, a knuckle connecting the proximate ends of the sections, one part of the knuckle having a lock notch, a turnable lock pin in the other part, and a normally pendent arm connected to the lock pin, which pin is in locking position as long as said arm hangs down alongside the lower section.

4. In a device of the class described having two sections, a knuckle connecting the proximate ends of the sections, one part of the knuckle having a lock notch, a turnable lock pin in the other part, .a normally pendent arm connected to the lock pin, which in is in locking position as long as said arm angs down alongside the lower section, and an eye on the lower end of the arm.

5. In a device of the class described. having two sections, a knuckle connecting the proximate ends of the sections, one part of the knuckle having a lock notch, a turnable lock pin in the other part, a normally pendent arm connected to the lock pin, which pin is in locking position as long as said arm hangs down alongside the lower section, and a catchon the lower end of said arm cooperative with the lower section.

6. In a device of the class described having two sections, a knuckle connecting the proximate ends of the sections, one part of the knuckle having a lock notch, a turnable lock pin in the other part, a normally pendent arm connected to the lock pin, which pin is in locking position as long as said arm hangs down alongside the lower section, a catch on the lower end of said arm cooperative with the lower post section, and an eye whereby the catch can be disengaged and the arm pulled outward to vunlock the knuckle and trip the device.

7. In a device of the class described having two sections, a knuckle connecting the proximate ends of the sections, one part of the knuckle having a lock notch, a turnable lock pin in the otherpart, a normally pendent arm connected to the lock pin which pin is in locking position as long as said arm hangs down alongside the lower section, and a gravity piece pivoted on the lower end of the arm and having a catch hook and an eye for tripping, the lower section having a portion for engagement by the catch hook.

8. A post comprising two sections, a knuckle connecting the sections, and a lock for the knuckle having a pendent arm adapted to be raised and pulled to release the lock and trip the post.

9. A post comprising two sections, a knuclale connecting the sections, and a lock for the knuckle having a pendent arm adapted to be raised and pulled to release the lock and trip the post, and a catch on the lower end of said arm cooperative with the lower post section.

10. A post qimprising two sections, a

knuckle connecting the sections, and a lock for the knuckle having a pendent arm adapted to be raised and pulled to release the lock and trip the post, and a pivotal 6 piece on the lower end of the pendenbarm having a catch cooperative with the lower post section and an eye for tripping.

11. A post comprising two sections, a

knuckle connecting the sections, and a lock for the knuckle having a pendent arm adapted to be raised and pulled to release the lock and trip the post, and a gravity catch hook pivoted on the lower part of the pendcnt arm, the lower post section having a recess to receive said catch hook.

FRANK H SCHWE RINQ 

